Experimentally this is associated with an anomalous behaviour of the dielectric susceptibility, for example in SrTiO 3 this is around 4K.
2.
The solid line indicates the anomalous behaviour of a quantum paraelectric where the dielectric susceptibility begins to diverge in the regular manner but levels off.
3.
The solid lines shows the quantum paraelectric frequency with quantum fluctuations preventing a ferroelectric instability from arising . b ) The dashed line shows the divergence of the dielectric susceptibility near the Curie temperature for a regular ferroelectric.
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